Statins are primarily used in the treatment and prevention of atherosclerosis, a condition where plaque builds up in the arterial walls, leading to narrowing and hardening of the arteries. High levels of LDL cholesterol contribute significantly to plaque formation. Statins lower LDL cholesterol and stabilize existing plaques, reducing the risk of heart attacks and strokes.
Option (a) Diabetes mellitus may coexist with high cholesterol but is not directly treated with statins.
Option (c) Anemia relates to reduced hemoglobin and is not influenced by statins.
Option (d) Asthma is a respiratory condition unrelated to cholesterol metabolism.
Therefore, atherosclerosis is the correct answer.